A mixture containing 35% of milk is mixed with another mixture containing 65% of milk in a ratio x : y. If the quantity of milk in the final mixture is 45%, find the ratio x : y.

Correct Answer: 2 : 1
The ratio in which the liquids are mixed = x : y. X : y = (65 – 45) : (45 – 35) = 20 : 10 = 2 : 1